Elizabeth Vargas Back in Rehab

ABC News reporter Elizabeth Vargas has returned to a recovery center to be treated for alcohol dependency, she and the network said Sunday.

The 20/20 co-anchor said in a statement obtained by PEOPLE that she checked into a treatment facility this weekend while on vacation.

"As so many other recovering alcoholics know, overcoming the disease can be a long and incredibly difficult process," Vargas said. "I feel I have let myself, my co-workers and most importantly my family down and for that I am ashamed and sorry."

Vargas, who's married to Marc Cohn and has two children with the singer-songwriter, said she was "committed to battling and addressing this debilitating disease" and expressed thanks for the support she has received.

The network said in a statement that it stands "squarely behind her" and was focused on Vargas's health.

"We look forward to having her back at ABC News when she feels ready to return," ABC News said.